It's a component to make all kinds of Jewellery: Rings, Necklaces, Bracelets & Amulets.
gold bars
Almost anything in you inventory, what it means by turn into gold is turning an item into coins not coloring them gold.
Buttons.
A quest item can be any item on Gaia that a user is saving gold to get. Quest bars are common in signatures, which shows how close the user is to completing their quest.
try dragon-gate.com. They have this item. it is $28.00 for 3 bars.
No.
Just search for 'Runescape item ID database' and you'll find multiple services to search for item ID's.
There is no NPC, place, or item in RuneScape called "Kela."
No.
Buying Runescape gold is against the rules of Runescape. In any case, it is not clear how you are planning to pay. You can go to a site that sells Runescape gold - at your own risk, since any such transfer is against the rules of Runescape - and see what payment options they have.
bronze dagger
Wiki Answers will not provide the information to break the rules of RuneScape.